Hi,
I want to use IRQ_DM355_GPIO6 interrupt, I configure the GPIO6 pin so that
it generates an interrupt only at falling edge.
Below is my code:
long status;
poweron_gpio();
//set bit in BINTEN:: BANK0 , GPIO pin no. 6.
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x08));
printk("[Viet]::BINTEN = %x", status);
status |= 0x01;
__raw_writel( status, (( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x08)));
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x08));
printk("\tBINTEN = %x\n", status);
// clear raising edge of GPIO6
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x28));
printk("[Viet]::CLR_RIS_TRIG01 = %x", status);
status |= 0x00000040;
printk("\tCLR_RIS_TRIG01 = %x", status);
__raw_writel( status, (( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x28)));
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x28));
printk("\tCLR_RIS_TRIG01 = %x\n", status);
// set falling edge of GPIO6
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x2C));
printk("[Viet]::SET_FAL_TRIG01 = %x", status);
status |= 0x40;
printk("\tSET_FAL_TRIG01 = %x", status);
__raw_writel( status, (( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x2C)));
status = __raw_readl(( void* __iomem)IO_ADDRESS( GPIO_BASE + 0x2C));
printk("\tSET_FAL_TRIG01 = %x\n", status);
And here are the messages during kernel's boot:
..........
[Viet]::BINTEN = 1 BINTEN = 1
[Viet]::CLR_RIS_TRIG01 = 2 CLR_RIS_TRIG01 = 42 CLR_RIS_TRIG01 = 0
[Viet]::SET_FAL_TRIG01 = 0 SET_FAL_TRIG01 = 40 SET_FAL_TRIG01 = 40
..........
At the 2nd line, you can see the code cannot write 0x42 to CLR_RIS_TRIG01
register, it even clears that register to 0x0, that clears the raising edge
ethernet interrupt and causes the DHCP's failure then
(
eth0: link down
Sending DHCP requests .<6>eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
..<6>NETDEV WATCHDOG: eth0: transmit timed out
.<6>NETDEV WATCHDOG: eth0: transmit timed out
)
Do you know why? Please give me an advice.
Thanks,
Viet Hoang.
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